--- a/dom/media/mediasource/MediaSourceDemuxer.cpp
+++ b/dom/media/mediasource/MediaSourceDemuxer.cpp
@@ -24,19 +24,18 @@ MediaSourceDemuxer::MediaSourceDemuxer()
   : mTaskQueue(new AutoTaskQueue(GetMediaThreadPool(MediaThreadType::PLAYBACK),
                                  /* aSupportsTailDispatch = */ false))
   , mMonitor("MediaSourceDemuxer")
 {
   MOZ_ASSERT(NS_IsMainThread());
 }
 
 // Due to inaccuracies in determining buffer end
-// frames (Bug 1065207). This value is based on the end of frame
-// default value used in Blink, kDefaultBufferDurationInMs.
-const TimeUnit MediaSourceDemuxer::EOS_FUZZ = media::TimeUnit::FromMicroseconds(125000);
+// frames (Bug 1065207). This value is based on videos seen in the wild.
+const TimeUnit MediaSourceDemuxer::EOS_FUZZ = media::TimeUnit::FromMicroseconds(500000);
 
 RefPtr<MediaSourceDemuxer::InitPromise>
 MediaSourceDemuxer::Init()
 {
   return InvokeAsync(GetTaskQueue(), this, __func__,
                      &MediaSourceDemuxer::AttemptInit);
 }